Old SCSI to Normal SCSI pins

The convention used here is that the normal 50 pin, two-row cable starts at pin 1 on the upper left of the connector and goes to pin 25 before wrapping around: 

 1 ... 25
26 ... 50
and the old style three-row connector starts at pin 1 and goes to pin 17 before wrapping around: 
 1 ... 17
18 ... 33
34 ... 50
As usual, use this with the standard disclaimers, no warranty applies.
Normal two-row SCSI Old three-row SCSI
1 1
2 18
3 35
4 3
5 20
6 37
7 5
8 22
9 39
10 7
11 24
12 41
13 9
14 26
15 43
16 11
17 28
18 45
19 13
20 30
21 47
22 15
23 32
24 49
25 17
26 34
27 2
28 19
29 36
30 4
31 21
32 38
33 6
34 23
35 40
36 8
37 25
38 42
39 10
40 27
41 44
42 12
43 29
44 46
45 14
46 31
47 48
48 16
49 33
50 50
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